Re: [PATCH] drm/i915: Limit the auto arming of mmio debugs on vlv/chv

[Mika Kuoppala <mika.kuoppala@linux.intel.com>]

Daniel Vetter <daniel@ffwll.ch> writes:

> On Wed, Jan 20, 2016 at 12:32:23PM +0200, Mika Kuoppala wrote:
>> The capability to detect unclaimed register access was
>> recently introduced for vlv/chv platforms. Apparently
>> there are plenty of unclaimed access on these platforms,
>> resulting in new dmesg warns. But as we are trying to form
>> a beachhead for CI/Bat, all new warns are adding to the
>> noise and thus not desirable at this point in time.
>> 
>> Make it so that if in these platforms the automatic arming
>> was responsible for mmio_debug enabling, ignore the warns.
>> 
>> If user/dev wants to fix these, he can still do so by
>> i915.mmio_debug=1234.
>> 
>> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
>> Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
>
> Yeah it sucks, but otoh this will make CI more useful for everyone else
> and we can keep the original test coverage even.
>
> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

Applied to dinq. Thanks for review.

-Mika

>
>> ---
>>  drivers/gpu/drm/i915/intel_uncore.c | 9 +++++++++
>>  1 file changed, 9 insertions(+)
>> 
>> diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
>> index c3c13dc929cb..bfa79e5c214e 100644
>> --- a/drivers/gpu/drm/i915/intel_uncore.c
>> +++ b/drivers/gpu/drm/i915/intel_uncore.c
>> @@ -631,6 +631,15 @@ __unclaimed_reg_debug(struct drm_i915_private *dev_priv,
>>  		      const bool read,
>>  		      const bool before)
>>  {
>> +	/* XXX. We limit the auto arming traces for mmio
>> +	 * debugs on these platforms. There are just too many
>> +	 * revealed by these and CI/Bat suffers from the noise.
>> +	 * Please fix and then re-enable the automatic traces.
>> +	 */
>> +	if (i915.mmio_debug < 2 &&
>> +	    (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)))
>> +		return;
>> +
>>  	if (WARN(check_for_unclaimed_mmio(dev_priv),
>>  		 "Unclaimed register detected %s %s register 0x%x\n",
>>  		 before ? "before" : "after",
>> -- 
>> 2.5.0
>> 
>
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
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